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AOC Wipro WLA171t, Service Manual

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AOC Wipro WLA171t Service Manual Download Page 33

17” LCD Color Monitor                                       Wipro WLA171t            

33 

8.2 Trouble Shooting 

8.2.1 Main Board 

No Power 

       

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Please reinsert and make sure 

the AC of 100-240 is normal 

No power 

Press power key and look 

if the picture is normal

 

Measure U201 PIN2=2.5V 

U202 PIN2=3.3V 

Reinsert or check the 
Adapter/Inverter 
section

X601 and X401 oscillate 

waveforms are normal 

Check CN201 or replace 
U201, U202 

Replace U401 

Replace U601 

Replace X601, X401 

OK 

OK 

OK 

NG 

NG 

NG 

NG 

NG 

Summary of Contents for Wipro WLA171t

Page 1: ...on Instruction 6 3 1 General Instructions 6 3 2 Control Button 6 3 3 Adjusting the Picture 8 4 Input Output Specification 11 4 1 Input Signal Connector 11 4 2 Factory Preset Display Modes 11 4 3 Panel...

Page 2: ...17 LCD Color Monitor Wipro WLA171t 2 Revision List Revision Date Revision History TPV Model A00 Mar 02 07 Initial Release T76CM4HCALWNE...

Page 3: ...characteristics may create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from AOC AOC assumes no liability express or...

Page 4: ...t Clock 135MHz Max Resolution 1280 1024 75Hz Plug Play VESA DDC2BTM ON Mode 37W EPA ENERGY STAR OFF Mode 1W Input Connector 15 pin D Sub Input Video Signal Analog 0 7Vp p standard 75 OHM Positive Maxi...

Page 5: ...ightness control logic and DDC The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage Monitor Block Diagram HOST Computer AC IN 10...

Page 6: ...y changing these settings the picture can be adjusted to your personal preferences The power cord should be connected Connect the video cable from the monitor to the video card Press the power button...

Page 7: ...the MENU button while the monitor is off and then press power button to turn the monitor on To un lock the OSD press and hold the MENU button while the monitor is off and then press power button to t...

Page 8: ...s highlighted press the MENU button to activate it If the function selected has a sub menu press or again to navigate through the sub menu functions Once the desired function is highlighted press MENU...

Page 9: ...ce Vertical Line noise H Position Adjust the horizontal position of the picture Image Position V Position Adjust the vertical position of the picture Warm N A Recall Warm Color Temperature from EEPROM...

Page 10: ...on Adjust the vertical position of the OSD OSD Setup OSD Timeout Adjust the OSD timeout Language Language N A Select the language you like Informatio n Information N A Show the resolution H V frequenc...

Page 11: ...ue Return Analog Connector 1 5 6 10 11 15 4 2 Factory Preset Display Modes Standard Resolution Horizontal Frequency Vertical Frequency Dos mode 720 400 31 47kHz 70Hz 640 480 31 47kHz 60Hz 640 480 35 0...

Page 12: ...dule composed of LCD panel driver ICs control circuit and backlight By applying 8 bit digital data 1280 1024 16 2M color images are displayed on the 17 0 diagonal screen Input power voltage is 5 0V fo...

Page 13: ...17 LCD Color Monitor Wipro WLA171t 13 4 3 3 Electrical Characteristics 1 TFT LCD 2 Backlight...

Page 14: ...17 LCD Color Monitor Wipro WLA171t 14 5 Block Diagram 5 1 Software Flow Chart 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18...

Page 15: ...the LED and set it to green color Scalar initializes 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are there any signals coming 13 Does the scalar send out an interr...

Page 16: ...5 2 1 Main Board MCU W78E065A40PL U601 Scalar IC TSU16AK Include ADC OSD U401 D Sub Connector CN301 EEPROM M24C02 U301 H sync V sync RGB DB15_SDA DB15_SCL Panel Interface CN503 OSD Control Interface...

Page 17: ...filter Bridge Rectifier and Filter Start Circuit R906 R907 PWM Control IC Transformer Over Voltage Protect Rectifier diodes AC input 12V ON OFF Control PWM Control IC Feedback Circuit Output Circuit...

Page 18: ...VCC3 3 VAA1 VAA2 VAA3 VAA4 AD0 AD1 AD2 AD3 VAA1 VLCD B5 5 PANEL INTERFACE VLCD PB 0 9 PA 0 9 VCC3 3 VAA2 B1 3 INPUT RIN GIN BIN VSYNC GNDR GNDG GNDB ST_DET1 HSYNC SOG DDC_CLK DDC_DAT ST_DET2 R R G G...

Page 19: ...Number Rev Date Sheet of VAA1 GND VCPU 6 VCC12V 6 VCC5V VLCD C201 0 1uF Brightness VCC5V R208 10K 1 16W C214 0 1uF GND R204 10K 1 16W TO 263 R216 4 7K 1 16W VCC5V CN201 CONN 2 4 6 8 10 12 1 3 5 7 9 1...

Page 20: ...4 BAV70 1 2 3 VGA_CON D306 BAV99 3 1 2 PC5V R302 100 1 16W R314 10K 1 16W D318 TZMC5V6 GS08 R327 75 1 16W D315 LL5232B 5 6V 5 FB304 150 OHM D307 BAV99 3 1 2 SOG 4 R313 2 2K 1 16W C301 NC RXD 6 R305 10...

Page 21: ...P NC LVB2M NC LVB1P NC LVB1M NC LVB0P NC LVB0M DDC1_CLK GPO8 DDC1_DAT GPO7 ADO NC AD3 NC AVDD_PLL AVDD AVSS AVSS_DVI LVACKP LVA3M LVA3P AVSS AD1 NC AD2 NC BUS TYPE NC FB404 600 OHM R406 10K 1 16W GNDG...

Page 22: ...LVBCKP VLCD 2 LVA1M RXE0 RXO2 PB4 LVACKM PB 0 9 RXE1 PB3 LVB2P RXEC PB6 PB1 LVBCKM LVBCKM C509 47uF 16V PB8 LVB0P VLCD PA5 C510 0 1uF LVB3M RXOC PA9 LVB0P RXO0 LVA2M LVACKP LVA3P LVB3M LVA0M RXO0 PA3...

Page 23: ...T0 P3 2 INT1 P3 3 T0 P3 4 T1 P3 5 P1 0 P1 1 P1 2 P1 3 P1 4 P1 5 P1 6 P1 7 P0 0 P0 1 P0 2 P0 3 P0 4 P0 5 P0 6 P0 7 P2 0 P2 1 P2 2 P2 3 P2 4 P2 5 P2 6 P2 7 P3 7 RD P3 6 WR PSEN ALE P P3 1 TXD P3 0 RXD V...

Page 24: ...2 HZ12B2 C900 0 001uF 160V INR R929 3 9 1 16W CN301 PHONEJACK 5 1 2 4 3 C920 0 001uF 500V C922 1000uF 16V 12V R911 100K 1 10W R914 NC ZD905 RLZ20B C901 0 001uF 160V D912 31DQ06 R917 10 1 4W R928 1K 1...

Page 25: ...1 2SC5706 1 2 3 C215 22pF 6KV TP6 HVL 1 Q202 DTA144WKA R210 15K C217 22pF 6KV R231 1 5K D208 1N4148 CN202 1 2 3 Q204 SI4431DY T1 4 8 5 6 7 3 2 1 C224 1uF 25V R213 3 9K 2 FOR SAMSUNG M170EU L01 INVERTE...

Page 26: ...10 1 0uF VOLUME C209 1 0uF C203 0 1uF GND C207 470uF 16V R201 10K R208 1K 12V R211 5 6K 12V R212 220K R203 10K C211 100 pF CN203 WAFER 4P2 0 R A 1 2 3 4 U201 TDA7496L 1 2 3 4 5 6 7 8 9 10 11 12 13 14...

Page 27: ...17 LCD Color Monitor Wipro WLA171t 27 7 PCB Layout 7 1 Main Board...

Page 28: ...17 LCD Color Monitor Wipro WLA171t 28...

Page 29: ...17 LCD Color Monitor Wipro WLA171t 29 7 2 Power Board...

Page 30: ...17 LCD Color Monitor Wipro WLA171t 30...

Page 31: ...17 LCD Color Monitor Wipro WLA171t 31 7 3 Audio Board 7 4 Key Board...

Page 32: ...WLA171t 32 8 Maintainability 8 1 Equipments And Tools Requirement 1 Voltmeter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with an IBM Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Ser...

Page 33: ...he AC of 100 240 is normal No power Press power key and look if the picture is normal Measure U201 PIN2 2 5V U202 PIN2 3 3V Reinsert or check the Adapter Inverter section X601 and X401 oscillate wavef...

Page 34: ...m is normal Replace U601 Replace X601 Measure U201 PIN2 2 5V U202 PIN2 3 3V Check Correspondent component Replace U401 X401 oscillate waveform is normal Replace U201 U202 OK OK OK OK OK NG NG NG NG Ch...

Page 35: ...sure Q204 base is high level X601 oscillate waveform is normal Check Q203 Q204 are broken or CN503 solder Check Correspondent component Replace PANEL Check Correspondent component Replace U601 OK OK O...

Page 36: ...17 LCD Color Monitor Wipro WLA171t 36 8 2 2 Power Board No power...

Page 37: ...NG OK Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave NG OK Change U201 Check D201 D202 have the output of square wave at short time NG OK Check Q203 Q209 Q210 D201 Q204 Q211 Q212 D202...

Page 38: ...8 2 3 Key Board OSD is unstable or not working Is Key Pad Board connecting normally Connect Key Pad Board Is Button Switch normally Replace Button Switch OK NG NG Is Key Pad Board normally Replace Ke...

Page 39: ...witch the MEM Channel to Channel 3 with up or down arrow on chroma 7120 3 The LCD indicator on chroma 7120 will show x 296 20 y 311 20 Y 180 cd m2 4 Adjust the RED of color1 on factory window until ch...

Page 40: ...17 LCD Color Monitor Wipro WLA171t 40 10 Monitor Exploded View...

Page 41: ...S 033G4694 1 C 11 SHIELD 085G6080 2 3 BASE T34G1455 72 B 12 AUDIO BOARD AUPC780A9P 4 KEY BOARD KEPC780KMNP 13 MAIN BOARD CBPC780KC4AP 5 HINGE 037G 489 1 14 MAIN FRAME 015G6090 7 6 POWER BOARD PWPC1742...

Page 42: ...A PAPER BOARD 044G6002786 1A PAPER BOARD 044G9003220 CORNER PAPER 050G 600 2 HANDLE1 050G 600 3 HANDLE2 052G 1185 MIDDLE TAPE 052G 1186 SMALL TAPE 052G 1211 B AL TAPE 052G6025 11587 MYLAR 052G6025 117...

Page 43: ...R203 061G0603183 RST CHIPR 18 KOHM 5 1 10W R201 061G0603183 RST CHIPR 18 KOHM 5 1 10W R211 061G0603203 RST CHIPR 20 KOHM 5 1 10W R210 061G0603203 RST CHIPR 20 KOHM 5 1 10W C212 065G0805101 31 CHIP 100...

Page 44: ...1 061G 125103 8 RST CHIP AR 8P4R 10 KOHM 5 1 16W R642 061G0603000 RST CHIPR 0 OHM 5 1 10W R636 061G0603000 RST CHIPR 0 OHM 5 1 10W R502 061G0603000 RST CHIPR 0 OHM 5 1 10W R209 061G0603000 RST CHIPR 0...

Page 45: ...PR 10 KOHM 5 1 10W R613 061G0603103 RST CHIPR 10 KOHM 5 1 10W R614 061G0603103 RST CHIPR 10 KOHM 5 1 10W R615 061G0603103 RST CHIPR 10 KOHM 5 1 10W R625 061G0603103 RST CHIPR 10 KOHM 5 1 10W R626 061G...

Page 46: ...2 1000PF 10 50V X7R C610 065G0603102 32 1000PF 10 50V X7R C406 065G0603104 32 CHIP 0 1UF 50V X7R C407 065G0603104 32 CHIP 0 1UF 50V X7R C408 065G0603104 32 CHIP 0 1UF 50V X7R C409 065G0603104 32 CHIP...

Page 47: ...C604 065G0603220 31 CER1 0603 NP0 50V 22P PM C312 065G0603221 31 CER1 0603 NP0 50V 220P P C605 065G0603224 17 CAP CER 0 22UF 20 80 16V C311 065G0603330 31 CER1 0603 NP0 50V 33P PM C310 065G0603473 32...

Page 48: ...H PIN HEADER 2 6 R A SW105 077G 600 1GCJ TACT SWITCH TSPB 2 NP SW103 077G 600 1GCJ TACT SWITCH TSPB 2 NP SW102 077G 600 1GCJ TACT SWITCH TSPB 2 NP SW101 077G 600 1GCJ TACT SWITCH TSPB 2 NP SW104 077G...

Page 49: ...4700PF 20 400VAC C922 067G215L102 3R LOW E S R 1000UF 20 16V C925 067G215L102 3R LOW E S R 1000UF 20 16V C905 067G215Y10115K ELCAP 105 100UF M 450V L904 073G 253 91 H CHOKE COIL L903 073G 253 91 H CHO...

Page 50: ...05242 RST CHIPR 2 4 KOHM 5 1 8W R924 061G0805333 RST CHIPR 33 KOHM 5 1 8W R208 061G0805472 RST CHIPR 4 7 KOHM 5 1 8W R209 061G0805472 RST CHIPR 4 7 KOHM 5 1 8W R917 061G1206100 RST CHIP 10R 1 4W 5 R91...

Page 51: ...ZT52 C11 ZD904 093G 39S 19 T PTZ7 5B D201 093G2004 3 SSM24PT D202 093G2004 3 SSM24PT T901 006G 31502 1 5MM RIVET Q903 006G 31502 1 5MM RIVET PT202 006G 31502 1 5MM RIVET PT201 006G 31502 1 5MM RIVET N...

Page 52: ...6W R235 061G 60291152T CFR 910 OHM 5 1 6W R234 061G 60291152T CFR 910 OHM 5 1 6W C911 064G700J1020AT 1000PF 50V PEN C936 064G700J1040AT 0 1UF 50V PEN C206 064G700J1040AT 0 1UF 50V PEN C205 064G700J104...

Page 53: ...152T 1N4148 D208 093G 64 1152T 1N4148 D207 093G 64 1152T 1N4148 D206 093G 64 1152T 1N4148 D205 093G 64 1152T 1N4148 715G1103 3 17 POWER BOARD PCB Q40G 17N856 3A RATING LABEL Q44G3739856 2B CARTON Q45G...

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